Overload-switch.



J. K.DLAN0,1.

OVERLOAD SWITCH.

QPPLICATION HLD MAR. 3.19l5.

Fia'. 2 a Y L 2.2-

Ilm!" UNITED STATES PATENT OFFICE;

JAMES x. DELANo, Jn., oF LOUISVILLE, KENTUcx'Y.

OVERLOAD-SWITCH.

Speciucatlon et Letters Patent.

Patented Apr. 9, 1918.

Application nlcd Hai-ch B, 1915. Serial No. 13,047.

To all whom. it may concern:

Be it known that I, JAMES K. DmNo, Jr.,

'a citizen of the United States, residing at One of the objects of theiinvention is to:

provide an over-load switch, 4sim le and economical in construction and designed to occupy a minimum amount of space.

A further object of invention is to provide an over-load switch placed in a cir. cuit and adaptedf tio-utilize an'excessive current assing thtrethrou'gh' to magnetze a core or the purpose ofl attracting an`arma ture to dis lace a contact'member andithere# by break t e circuit.

With these and other objectsin view the' invention consists in certain novel features of construction and ari-an enient of parts hereinafter fully describe and illustrated in thc accompanying drawing, it bein understood that various changes in the orm, porportions and minor details. of the device may be made without departing from the spirit of the invention. i

In the accompanyin drawing Figure 1 represents a longitu mal sectional view through the device with the switch in closed position. Fig. 2 represents a similar view showing the 'device connected up with a battery and e series of lamps with the switch in open position.

Similar numerals of reference are eniplayed to 'indicate corresponding arts throughout the several figures of the rawing.

Referring to the drawings 'by numerals, 10 represents a casing closed at one end by an insulating block 11 and at the other end by a circular flange ll2 carryin a core 13 formed of magnetic material an extending into the casing 10. The block 11 and flange positioned in the 12 are provided with shoulder portions, 14 and 15 respectively to receive the ends of thecasing 10. Mounted on the flange 12 is a plate 16 secured tothe -tlan e by a screw 17 and adapted to be connec to any suit- {lble holdin device. Passing through the insulating b ock 11 are binding posts 18 and 19. Post 18 is connected with a battery 20 by a. wire 21A `andpost 1Q is connected to a.

lamp 22 by wire 23 the battery 20 and lamp 22 Vbem connected by a wire 24. Secured upon e linside face of the insulating block 4,11 and connected 'with 'thebindin post1 8 is a contact sprin member 2,5 an

opposite thereto'is a simi ar contact sprin member 26 secured to 'the-insulating bl 11 by a screw27; The contact springfmemgli an le bers extend 'into the 'casingat a sli to the center thereof and are provided with essreesed portions 28 and outwardly sloping @extending therefrom. A rod provided on the outer end thereof with e'. cap 31,

formed 'of material, is designed to pgss 'through the plate l'andcore 13 and to held in engagement therewith. The inner end of e rod is provided with a reduced portion 32 upon which is mounted an amature Bein axialjalinement with the core 13. Mountedupon--tlie-reduced portion 32 is an insulating meiber'havin'g-a. central' rtion 35 with a circular flange-36 'en aging thefarmahire 34 and an'inwardly slop l da' cl3? spaced from the dange 36. e i b y a ,nut 38 screwed upon the reduced portion 32. Positioned around the central portion 'and between the"tlanges 36 and 37 of the insulating is' a cirmilarlcontact member 39 havinga.v lsubstantially rounded or pointed periphe 'adapted to be normally the contact sprin members 25 and 26 as shown in Fig. l..`

the core'13 has one end connected .with the base of the contact spring member 26 and the other end connected to the post 19Y so that whenthe circular contact member 39 is in engagement with the contact spring,A

members 25 and 26, current may flow through the switch from the battery' 20 to the lamp 22. c y

Although I haveV shown myover-load switch in'connection with a lamp circuit, it

winding 40 surrounding ating "member-isV held in position can readily bcsecn that the device may be used 1n connection with other circuits as well.

The operation of my improved device is Y 5 as follows: When the switch is in contact osition as shown in Fig. 1 current from the f attery 20 will pass through the wire 21, the post 18, the contact spring member 25 and the circular contact member 39 to the contact spring member 26 and thence through the 145 Winding 40 to magnetize vthe core 13 suiliciently to attract the amature to the core i o and thus pull the contact member 39 out of engagement with the contact springs 25 and A, g 2 6. v. In this way the circuit will be broken i as shown in Fig. 2 and the danger of overloading `the wires be avoided. .'It will be 'seen by observing the contact spring in Fig. 4.2 that the outwardly hsloping ends 29 thereof do not touch the contact member 39 but rest upon the edge of the sloping flange of insulating material lying against thev contact `'member 39. VBy pushing the cap 31 in Fig.

.2 the-.cmact springs are forced apart until .h-fthe periphery of the contact member 39 is 5.30;- forced into the depressed portion 28 of the springs and the circuit is restored between thebattery and the lamps. -Whatl cla-im is: y

1. .In combination, an electric circuit, a

, i .35. currentlimiting device included therein land .f :comprising a casing having lixed contact 1.members formed of resilient material posi- -tioned Within the casing and having out.- .wardly sloping ends, a core of magnetic ma.-

504 tcrial, arod passing through the core in sliding engagement therewith, an armature amountedon .the `rod and'` normally spaced from the core; a contact `member positioned., ,1 ,w onlthe rod within the casing and normally l 4,6 engaging the resilient contact members, a

-,;,magnetic -coil surrounding the c oreandA 'uadap'ted-to energize the same for attracting 'the armature to separate the contact 'meme ,bcrs -when the current -in the circuit exceeds '44:50' a predetermined value, and-an insulating 1 member'carried by, therod `and having a `sloping face adapted` to rest on the out- -2.'.In'-combination, an electric circuit, 'a

current limitin deviceincluded therein and 'Y comprising resi ient coutactmembers having depressed 4portions near their ends, an ar- LIE a'Of-maturc, a movable contact member normally engaging the resilient contact members in the; depressed portions thereof, la core in proximity to the armature, a magnetic windmember .extending ing surrounding the core for the purpose of energizing the same to attract the' armature and break the circuit when the current therein exceeds a predetermined value, and means for insulating the movable Contact member from the resilient contact members, said means serving to support the armature upon the free ends of the resilient contact mem bers when the circuit is broken.

3. In combination, an electric circuit, a current limitin device included therein comprising a casing having a core in one end thereof and fixed contact members in the other end pro'ecting toward the'core, an armature mova ly mounted between the core and inner ends of the fixed contact members and normally spaced from the core, a movable contact member connected with the armature normally engaging the fixed contact members and an insulating member adapted to iinsulate the movable contact member from the fixed contact members when current in the circuit exceeds a predetermined amount 'sullicient to cause the core to attract the armature.

4. In combination, an electric circuit, a .current limiting device included therein comrising a casing of magnetic material hav- 'mg one end provided with an insulating member and the other with a head having a corel thereon projecting into the casing, contact membersmounted upon the insulating toward the core having their free ends rovided with recesses near the extremities t ereof an armature slidably mounted between the dore and contact members and normally spaced from the core, a movable contact member connected with and 'v -insulated from the armature and normally engaging the first mentioned contact mem- 'bers Within the recesses thereof, a magnetic coil surrounding thecore having one end connected .with said circuit independently of the first mentioned contact members and the otherend connected` with one-of said contact members whereb when current in the circuit exceeds a p etermined amount .the core wllnttract the amature and break -the circuit.

5.V In combination, an' electric circuit, a4

l the core and inner ends of the fixed contact 4 members, a movable contact member connected with the armature normally engaging the fixed contact members, a magnetic coil surrounding the core'normally included in the circuit through the movable and fixed contact members and an insulating member adapted to insulate the' movable contact member from the fixed contact members when current in the circuit exceeds a. predetermined amount suicientto attract said amature.

O JAMEQKDELANO, JR..

Witnesses:

Bm'rrll McGnAw, JOHN E. Mmmm. 

